User`s guide

Rev. 1.10 28 November 14, 2014 Rev. 1.10 29 November 14, 2014
HT66FW2230
Wireless Charger A/D Flash 8-Bit MCU
Reading Data from the EEPROM
ToreaddatafromtheEEPROM,thereadenablebit,RDEN,intheEECregistermustrstbeset
hightoenablethereadfunction.TheEEPROMaddressofthedatatobereadmustthenbeplaced
intheEEAregister.IftheRDbitintheEECregisterisnowsethigh,areadcyclewillbeinitiated.
SettingtheRDbithighwillnotinitiateareadoperationiftheRDENbithasnotbeenset.When
thereadcycleterminates,theRDbitwillbeautomaticallyclearedtozero,afterwhichthedatacan
bereadfromtheEEDregister.ThedatawillremainintheEEDregisteruntilanotherreadorwrite
operationisexecuted.TheapplicationprogramcanpolltheRDbittodeterminewhenthedatais
validforreading.
Writing Data to the EEPROM
TowritedatatotheEEPROM,thewriteenablebit,WREN,intheEECregistermustrstbeset
hightoenablethewritefunction.TheEEPROMaddressofthedatatobewrittenmustthenbe
placedintheEEAregisterandthedataplacedintheEEDregister.IftheWRbitintheEECregister
isnowsethigh,aninternalwritecyclewillthenbeinitiated.SettingtheWRbithighwillnotinitiate
awritecycleiftheWRENbithasnotbeenset.AstheEEPROMwritecycleiscontrolledusingan
internaltimerwhoseoperationisasynchronoustomicrocontrollersystemclock,acertaintimewill
elapsebeforethedatawillhavebeenwrittenintotheEEPROM.Detectingwhenthewritecycle
hasnishedcanbeimplementedeitherbypollingtheWRbitintheEECregisterorbyusingthe
EEPROMinterrupt.Whenthewritecycleterminates,theWRbitwillbeautomaticallyclearedto
zerobythemicrocontroller,informingtheuserthatthedatahasbeenwrittentotheEEPROM.The
applicationprogramcanthereforepolltheWRbittodeterminewhenthewritecyclehasended.
Write Protection
Protectionagainstinadvertentwriteoperationisprovidedinseveralways.Afterthedeviceis
powered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite
operations.Alsoatpower-ontheMP1H/MP2H,willberesettozero,whichmeansthatData
MemoryBank0willbeselected.AstheEEPROMcontrolregisterislocatedinBank1,thisaddsa
furthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogramoperation,
ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainstincorrect
writeoperations.
EEPROM Interrupt
TheEEPROMwriteinterruptisgeneratedwhenanEEPROMwritecyclehasended.TheEEPROM
interruptmustrstbeenabledbysettingtheDEEbitintherelevantinterruptregister.Howeveras
theEEPROMiscontainedwithinaMulti-functionInterrupt,theassociatedmulti-functioninterrupt
enablebitmustalsobeset.WhenanEEPROMwritecycleends,theDEFrequestflagandits
associatedmulti-functioninterruptrequestagwillbothbeset.Iftheglobal,EEPROMandMulti-
functioninterruptsareenabledandthestackisnotfull,ajumptotheassociatedMulti-function
Interruptvectorwilltakeplace.WhentheinterruptisservicedonlytheMulti-functioninterruptag
willbeautomaticallyreset,theEEPROMinterruptagmustbemanuallyresetbytheapplication
program.MoredetailscanbeobtainedintheInterruptsection.